1. WPI-Advanced Institute for Materials Research; Tohoku University; Sendai 980-8578 Japan
2. Department of Life Science and Medical Bioscience; Graduate School of Advanced Science and Engineering; Waseda University; Tokyo Japan
3. Department of Chemistry & Division of Biomedical Engineering; Hong Kong University of Science & Technology; Hong Kong China
4. Center for Biomedical Engineering; Department of Medicine, Brigham and Women's Hospital; Harvard Medical School; Harvard-MIT Division of Health Sciences and Technology; Massachusetts Institute of Technology; Wyss Institute for Biologically Inspired Engineering at Harvard University; Boston MA 02115 USA
5. Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology; School of Dentistry; Kyung Hee University; Seoul 130-701 Republic of Korea
6. Department of Physics; King Abdulaziz University; Jeddah 21569 Saudi Arabia